DHH on Twitter: "Puma starting in single mode... * Version 3.12.0 (ruby 2.6.2-p47), codename: Llamas in Pajamas I kinda love watching the Ruby community age. Codenames are no longer just Hitchhiker references,
Deploying Rails Applications with the Puma Web Server | Heroku Dev Center
Docker Ruby on Rails guide. Dockerize RoR app in 3 minutes